A Dual Low Voltage Chopper Offset-Stabilized Operational Amplifier

The paper presents a dual low voltage chopper offset-stabilized operational amplifier with symmetrical RC notch filters, having a 1.6-5.5 V supply range, and being fabricated in a 0.25 µm CMOS process. The chopping frequency is 100 kHz. A new constant-gm technique is implemented within the input sta...

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Bibliographic Details
Main Authors: Stanescu, Cornel, Dinca, Cristian, Veselu, Adrian, Cojan, Radu Adrian, Sevcenco, Andrei, Bricicaru, Victor, Croitoru, Adrian
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Chopper offset-stabilized operational amplifier
Choppers (circuits)
CMOS process
constant-gm
high CMRR
low noise
low offset
Low voltage
Notch filters
Operational amplifiers
PTAT bias currents
symmetrical RC notch filters
Voltage
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Summary:The paper presents a dual low voltage chopper offset-stabilized operational amplifier with symmetrical RC notch filters, having a 1.6-5.5 V supply range, and being fabricated in a 0.25 µm CMOS process. The chopping frequency is 100 kHz. A new constant-gm technique is implemented within the input stage of main amp, improving most electrical performances. The amplifier has a typical offset voltage of 1 µV, a minimum PSRR of 128 dB, a minimum CMRR of 120 dB, a noise PSD of 42 nV/√Hz, 1.5 MHz unity gain bandwidth, and THD + noise of 0.001 % at 1 kHz, while consuming 70 µA per channel.
ISSN:2377-0678
DOI:10.1109/CAS52836.2021.9604191